chore: remove py2neo as dependency and upgrade

The py2neo package exists to support CourseGraph, which required the
Neo4j database. Support for it was removed before the Sumac cut, tracked
by the following DEPR:
  #34342

This dependency looks like a bit of leftover code that was overlooked
during the removal process.

Author: ormsbee

requirements/edx-sandbox/base.txt

@@ -12,24 +12,24 @@ click==8.1.8
     # via nltk
 codejail-includes==1.0.0
     # via -r requirements/edx-sandbox/base.in
-contourpy==1.3.1
+contourpy==1.3.2
     # via matplotlib
 cryptography==44.0.2
     # via -r requirements/edx-sandbox/base.in
 cycler==0.12.1
     # via matplotlib
-fonttools==4.56.0
+fonttools==4.57.0
     # via matplotlib
 joblib==1.4.2
     # via nltk
 kiwisolver==1.4.8
     # via matplotlib
-lxml[html-clean,html_clean]==5.3.1
+lxml[html-clean,html_clean]==5.4.0
     # via
     #   -r requirements/edx-sandbox/base.in
     #   lxml-html-clean
     #   openedx-calc
-lxml-html-clean==0.4.1
+lxml-html-clean==0.4.2
     # via lxml
 markupsafe==3.0.2
     # via
@@ -53,15 +53,15 @@ numpy==1.26.4
     #   matplotlib
     #   openedx-calc
     #   scipy
-openedx-calc==4.0.1
+openedx-calc==4.0.2
     # via -r requirements/edx-sandbox/base.in
-packaging==24.2
+packaging==25.0
     # via matplotlib
-pillow==11.1.0
+pillow==11.2.1
     # via matplotlib
 pycparser==2.22
     # via cffi
-pyparsing==3.2.1
+pyparsing==3.2.3
     # via
     #   -r requirements/edx-sandbox/base.in
     #   chem
@@ -77,7 +77,6 @@ scipy==1.15.2
     # via
     #   -r requirements/edx-sandbox/base.in
     #   chem
-    #   openedx-calc
 six==1.17.0
     # via
     #   codejail-includes